dsh-enter-lock: Adding an Enter-to-Send Lock to DeepSeek Harness Web Input Fields

dsh-enter-lock is a lightweight plugin for DeepSeek Harness Web, designed to address the issue of messages being sent prematurely due to accidental presses of the Enter key when editing long texts or using Chinese input methods. The plugin provides a lock-shaped button in the slot to the right of the official input box, enabling an Enter-to-send lock function. Key features include: when locked, both regular Enter and Ctrl/Cmd+Enter do not trigger sending, while Shift+Enter for line breaks, IME candidate confirmation, and `@`/`/` menu operations remain functional; clicking the send button with the mouse still works normally. The plugin supports shortcut key toggling (Windows/Linux: Ctrl+Shift+K, macOS: Cmd+Shift+K), and the lock state is independently maintained per conversation.